问题

如何翻转这个三角形？

我制作了一个算术序列三角形。它是颠倒的。
如何将它旋转180度？

例如：

<pre>
1=1
1+2=3
1+2+3=6
等等...
</pre>
我的代码：

package javaapplication4;

public class NewClass5 {
public static void main(String[] args) {
int i=5,a;
for(int j=i; j>=1; j--) {
for(a=1; a<=i; a++)
System.out.print(a + " + ");
int n = 0;
for(a = 1; a<=i; a++) {
n = n + a;
}
System.out.print(" = "+ n);
System.out.println();
i--;
}
}
}

<details>
<summary>英文:</summary>

[How to flip this triangle?][1]


  [1]: https://i.stack.imgur.com/FCE5G.png

So i was making aritmethic sequance triangle. It was upside down.
How do I turn it 180 degree?

for example:

&lt;pre&gt;
1=1
1+2=3
1+2+3=6
etc...
&lt;/pre&gt;
my code:

package javaapplication4;

public class NewClass5 {
public static void main(String[] args) {
int i=5,a;
for(int j=i; j>=1; j--) {
for(a=1; a<=i; a++)
System.out.print(a +" + ");
int n = 0;
for(a = 1; a<=i; a++) {
n = n + a;
}
System.out.print(" = "+ n);
System.out.println();
i--;
}
}
}

</details>


# 答案1
**得分**: 0

我认为你只需要将循环的顺序从降序改为升序，其余部分应保持不变：

```java
for (int i = 1; i <= 5; i++) {
    int sum = 0;
    for (int j = 1; j <= i; j++) {
        System.out.print(j);
        if (j == i) 
            System.out.print("=");
        else 
            System.out.print("+");    
        sum += j;    
    }
    System.out.println(sum);
}

当我运行这段代码时，我能够看到预期的输出：

src: $ java NewClass5 
1=1
1+2=3
1+2+3=6
1+2+3+4=10
1+2+3+4+5=15

for (int i = 1; i <= 5; i++) {
    int sum = 0;
    for (int j = 1; j <= i; j++) {
        System.out.print(j);
        if (j == i) 
            System.out.print("=");
        else 
            System.out.print("+");    
        sum += j;    
    }
    System.out.println(sum);
}

src : $ java NewClass5 
1=1
1+2=3
1+2+3=6
1+2+3+4=10
1+2+3+4+5=15

答案2

得分: 0

你可以针对任何 n 进行操作，通过从用户获取输入。

    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    for (int i = 1; i <= n; i++) {
        int add = 0;
        for (int j = 1; j <= i; j++) {
            System.out.print(j);
            if (j == i)
                System.out.print("=");
            else
                System.out.print("+");
            add += j;
        }
        System.out.println(add);
    }

Scanner sc = new Scanner(System.in);
	int n = sc.nextInt();
	for (int i = 1; i <= n; i++) {
	    int add = 0;
	    for (int j = 1; j <= i; j++) {
	        System.out.print(j);
	        if (j == i) 
	            System.out.print("=");
	        else 
	            System.out.print("+");    
	        add += j;    
	    }
	    System.out.println(add);
	}